Derrick.



PATENTED JAN. 23, 1906. W. J. NEWMAN.

DERRICK. nruoymon mum mm a, 1905.

UNI ED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented Jan. 23, 1906.

Application filed June 5. 1905. Serial No. 263,725-

To all whom, it may concern.-

Be it known that I, WILLIAM J. NEWMAN, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Derricks, of which the following is a specification.

This invention relates more particularly to .derricks provided with swinging booms,

' sion of the spring and the weight of the load,

and such other objects as will be pointed out in the following description.

In the accompanying drawings, illustrating this invention in a partially-diagrammatical manner, Figure 1 represents a side elevation of a derrick having a bull-wheel rovided with my improved cable attaching devices; and Fig. 2 is a top plan View of the same, parts being broken away or omitted in each figure for convenience in illustration.

As shown in the drawings, 3 represents a derrick of any ordinary or preferred form of construction, said derrick being pivoted at 4 to any substantial base. The mast 5 and boom 6 are adapted to operate in connection with suitable cables and block and tackle (not shown) for the purpose of raising and lowering the load.

The derrick is swung by means of a bullwheel 7, which is secured to its lower framework in connection with cables 8 and 9. These cables pass to the drum or drums of a hoisting-engine which is used for o erating the derrick. Heretofore such cab es have been rigidly secured to the wheel, with the consequent disadvantage of causing great strain on the shaft of the drum and also on the derrick and cables themselves. Furthermore, with the cables rigidly secured to I the bull-wheel the derrick is given a more or less jerky motion in starting and stopping, tending thereby to wrench the boom and its connecting parts. The main object of this invention is to attach the cables to the wheel in a resilient manner or provide means for a resilient or yielding action of the cables in connection with the bull-wheel. The drawings show a preferred form of construction embodying this invention, each of the cables 8 and 9 being passed about half-way around the wheel 7 before leadinggofl' to the drum. The ends of the cable are secured, by means of loops or eyes 10 and clevises 11, to the ends of levers 12 and 13. These levers extend through slots in the sides of the wheel and are pivoted at 14 to suitable bearings 15 on the inside of the Wheel. At the inner ends of the levers is a plurality of holes 16 for the engage ment of clevises 17, which are adapted to con nect with springs 18 and19 to hold said levers in normal position.

The spring 18 is shown as a compressionspring which acts through washers or the like 19 and rods 20 and 21, the latter being pivoted at 22 to a suitable bearing 23 on the inner side of the wheel. The spring 19 is shown as a tension-spring which connects directly with the clevises 17 and with a second clevis 24 with a similar lug or bearing 23.

The operation of this invention will be readily understood from the above description and the drawings. If the derrick is to be turned in the direction of movementof the hands of a clock, a tension is given to the ca ble 9 by means of the hoisting-drum or other device. This tension is transmitted to the lever 12; but instead of the pull giving a jerk on the wheel the lever 12 will yield against the tension of the spring 18, so that the derrick will be swung with a yielding or resilient motion. Likewise, when the derrick is to be returned to its original position the opposite cable 8 Will be-given a pull, and its tension Wlll be transmitted to the bull-wheel through the medium of the pivoted lever 13 and spring 19. The clevises 17 may of course be adjusted to different positions on the levers 16, according to the strength of the springs and the tension on the cables, the preferable arrangement being one in which the tension of the springs will about balance the pull on the cables.

It will be obvious that various modifications will readily suggest themselves as coming within the scope of this invention, and I do not wish to limit myself to the exact construction or details herein shown and described but What I claim, and desire to secure by Letters Patent, is

1. The combination with a derrick bull- Wheel, of a lever pivoted to said Wheel, an opcrating-cable connected to one end of said lever, and a spring connected to the opposite end of said lever and to said Wheel.

2. The combination With a bull-Wheel for a derrick, of a lever pivoted to said Wheel With one end extending out therefrom, an operating-cable connected with said outer end, a compression-spring connected With the inner end of said lever and with said Wheel, the arrangement bein such that the tension of the spring is opposed to the pull on said cable.

3. In a derrick, the combination of a bull- Wheel or the like, a bearing adjacent to the periphery of said Wheel, a lever pivoted to said bearing and extending out from said Wheel, an operating-cable connected to the outer end of said lever and engaging With the outer periphery of said Wheel, rods or the like adjustably connected With the inner end of said lever, a second rod connected to a bearing on the inner periphery of said Wheel, and a compression-spring adapted to coact With said rods to oppose the pull on said cable.

WILLIAM J. NEWMAN. Witnesses:

L. SORGENFREI, L. WALDMAN. 

